Seismic Response Analysis to Half Floating System of Cable-Stayed Bridge

2014 ◽  
Vol 619 ◽  
pp. 81-90
Author(s):  
Xiu Yun Gao ◽  
Yi Tan Jiang
Keyword(s):  
Seismic Response ◽  
Response Spectrum ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Response Analysis ◽  
Analysis Method ◽  
Element Analysis ◽  
Design Data ◽  
Cable Stayed Bridge ◽  
Floating System

According to the Chaoyang town east bridge design data, build the model with finite element analysis method. Based on two levels fortification, two stage design ideas of seismic design, modal response spectrum and seismic response of the nonlinear time history analysis method are used respectively. The nonlinear effect of the boundary conditions are considered in the analysis process, and the seismic response of the cable-stayed bridge is obtained, providing bases and presenting methods for aseismic design of Chaoyang town east bridge.

Seismic Response Analysis of the Semi-Floating System of Long Span Cable-Stayed Bridge

2013 ◽  
Vol 361-363 ◽  
pp. 1302-1305
Author(s):  
Qing Zhao
Keyword(s):  
Seismic Response ◽  
Seismic Waves ◽  
Response Spectrum ◽  
Calculation Model ◽  
Response Analysis ◽  
Element Analysis ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Floating System ◽  
Space Beam Element

According to the seismic performance of cable-stayed bridge with a project example, using finite element analysis method, establishing the space beam element and link element calculation model, the dynamic characteristic and the seismic response of the cable-stayed bridge with selected three earthquake waves were calculated, the results were compared with the of the response spectrum method.The results show that:the semi-floating system of cable-stayed bridge is great flexibility, the vibration cycle is generally longer; the results by using the response spectrum method are smaller; the cable-stayed bridge should be calculated in accordance with the specific circumstances of the project with multiple seismic waves.

The Seismic Response Analysis of Long-Span Cable-Stayed Bridge

2014 ◽  
Vol 501-504 ◽  
pp. 1364-1367
Author(s):  
Yong Zhe Niu ◽  
Wen Jie Guo ◽  
Guang Ling Li ◽  
Rui Xin Sun
Keyword(s):  
Seismic Response ◽  
Lateral Displacement ◽  
Response Spectrum ◽  
Three Dimensional ◽  
Vertical Displacement ◽  
Response Analysis ◽  
Element Analysis ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Seismic Property

Anti-seismic property was essential in the progress of bridge designing and construction due to destructive power of earthquake disaster and increasing span of bridge. This paper elaborated theory method of analysis, taking five spans continuous cable-stayed bridge which was half floating system as an engineering background, and using method of special finite element analysis to calculating dynamic characteristics and seismic response respectively which also considered longitudinal limit damping and stiffness of cable under longitudinal, transverse, vertical and three-dimensional seismic oscillation. Fundamental frequency of cable-stayed bridge was affected significantly with considering longitudinal limit damping, so connection measures would be determined reasonably in designing and analyzing anti-seismic property of long-span cable-stayed bridge. When response spectrum analysis was adopted, longitudinal and vertical displacement were larger than lateral displacement under longitudinal seismic oscillation, lateral seismic oscillation only affected the structural lateral displacement, and vertical seismic oscillation affected vertical and longitudinal displacement.

Study on Seismic Resistant Properties of the Integral Structure after Adding Steel Storey on Top of the Multistoried Brick-Concrete Architecture

2014 ◽  
Vol 576 ◽  
pp. 81-85
Author(s):  
Yan Hua Guo ◽  
Xi Cao ◽  
Liang Wang
Keyword(s):  
Finite Element ◽  
Response Spectrum ◽  
Sudden Change ◽  
Time History ◽  
Bottom Layer ◽  
Horizontal Displacement ◽  
Response Analysis ◽  
Analysis Method ◽  
Element Analysis ◽  
Set Up

The whole quality, stiffness and damping of the structure have changed a lot after retrofitting with steel adding layer. It should make seismic response analysis for the overall structure. Use finite element analysis software SATWE to set up finite element models for a three-layer masonry structure with steel top-adding layer. Bottom layer shear, bottom layer axial force and the horizontal displacement of Y direction are obtained by using response spectrum analysis method and time history analysis method. Analysis results indicate that the stories with sudden change in stiffness show less resistance against the earthquake and require special attention in design. Under earthquakes, the analysis to determine the integrated performance of the structure is necessary.

scholarly journals Research on Fluid Viscous Damper Parameters of Cable-Stayed Bridge in Northwest China

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Xiongjun He ◽  
Yongchao Yang ◽  
Xiang Xiao ◽  
Yulin Deng
Keyword(s):  
Constitutive Relation ◽  
Yellow River ◽  
Time History ◽  
Northwest China ◽  
Nonlinear Time History Analysis ◽  
Normal Equation ◽  
Seismic Zone ◽  
Analysis Method ◽  
Fluid Viscous Dampers ◽  
Cable Stayed Bridge

To optimize the aseismic performance of nonlinear fluid viscous dampers (FVD) of cable-stayed bridge in the highly seismic zone, Xigu Yellow River Bridge in northwest China is taken as an example. Nonlinear time-history analysis method is used to research on the relation among the internal forces, displacements, and damping parameters of the 650 tonnage FVD. The method of getting the minimum of binary functions is used to obtain the optimal parameters of FVD. Also, the 1 : 1 full-scale FVD model is made and used in the constitutive relation test. Then the test result of the damping parameters can be got by normal equation method. The optimized method to obtain the damping parameters is further verified. The results indicate that seismic response in key positions of the cable-stayed bridge can be reduced by installing longitudinal nonlinear FVD between the towers and girders if choosing reasonable damping parameters C and ξ. The optimal damping parameters can be calculated accurately by the proposed method of optimizing damping parameters of nonlinear FVD, and the constitutive relation test verifies the correctness of the optimization analysis method. Conclusions concerned can be applied to the design of nonlinear FVD for cable-stayed bridges.

Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities: Part 3 — Seismic Response of Crossover Piping for Seismic Isolation System

2014 ◽  
Author(s):  
Akihito Otani ◽  
Teruyoshi Otoyo ◽  
Hideo Hirai ◽  
Hirohide Iiizumi ◽  
Hiroshi Shimizu ◽  
...  
Keyword(s):  
Seismic Response ◽  
Nuclear Power ◽  
Seismic Isolation ◽  
Evaluation Method ◽  
Response Spectrum ◽  
Time History ◽  
Response Analysis ◽  
Isolation System ◽  
Isolation Systems ◽  
Seismic Isolation Systems

This paper, which is part of the series entitled “Development of an Evaluation Method for Seismic Isolation Systems of Nuclear Power Facilities”, shows the linear seismic response of crossover piping installed in a seismically isolated plant. The crossover piping, supported by both isolated and non-isolated buildings, deforms with large relative displacement between the two buildings and the seismic response of the crossover piping is caused by two different seismic excitations from the buildings. A flexible and robust structure is needed for the high-pressure crossover piping. In this study, shaking tests on a 1/10 scale piping model and FEM analyses were performed to investigate the seismic response of the crossover piping which was excited and deformed by two different seismic motions under isolated and non-isolated conditions. Specifically, as linear response analysis of the crossover piping, modal time-history analysis and response spectrum analysis with multiple excitations were carried out and the applicability of the analyses was confirmed. Moreover, the seismic response of actual crossover piping was estimated and the feasibility was evaluated.

Study on Piping Response Under Multiple Excitation: Part 2 — Validation for Multiple Excitation Analysis of Piping

2013 ◽  
Author(s):  
Satoru Kai ◽  
Tomoyoshi Watakabe ◽  
Naoaki Kaneko ◽  
Kunihiro Tochiki ◽  
Makoto Moriizumi ◽  
...  
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Nuclear Power ◽  
Response Spectrum ◽  
Time History ◽  
Response Spectra ◽  
Shaking Table ◽  
Response Analysis ◽  
Multiple Time ◽  
Floor Response Spectra

The piping in a nuclear power plant is laid across multiple floors of a single building or two buildings, which are supported at many points. As the piping is excited by multiple-inputs from the supporting points during an earthquake, seismic response analysis by multiple excitations is needed to obtain the exact seismic response of the piping. However, few experiments involving such multiple excitation have been performed to verify the validity of multiple excitation analysis. Therefore, analysis of the seismic design of piping in Japan is performed by the enveloped Floor Response Spectrum (FRS), which covers all floor response spectra at all supporting points. The piping response estimated by enveloped FRS is conservative in most cases compared with the actual seismic response by multiple excitations. To perform rational seismic design and evaluation, it is important to investigate the seismic response by multiple excitations and to verify the validity of the analytical method by multiple excitation test. This paper reports the validation results of the multiple-excitation analysis of piping compared with the results of the multiple excitations shaking test using triple uni-axial shaking table and a 3-dimensional piping model (89.1mm diameter and 5.5mm thickness). Three directional moments from the analysis and the shaking test were compared on the validation. As the result, it is confirmed that the analysis by multiple time history excitation corresponds with the test result.

scholarly journals Dynamic Characteristics and Seismic Response Analysis of Self-Anchored Suspension Bridge

2012 ◽  
Vol 5 ◽  
pp. 183-188
Author(s):  
Lian Zhen Zhang ◽  
Tian Liang Chen
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Dynamic Characteristics ◽  
Response Spectrum ◽  
Time History ◽  
Suspension Bridge ◽  
Bridge Engineering ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Seismic Design Code

Self-anchored suspension bridge is widely used in Chinese City bridge engineering for the past few years. Because the anchorage system of main cable has been changed from anchorage blocks to the ends of the girder, its’ dynamic mechanics behavior is greatly distinguished with the traditional earth anchored suspension bridge. This paper studies the dynamic characteristics and seismic response of one large-span self-anchored suspension bridge which is located in China/Shenyang city. Using a spatial dynamic analysis finite element mode, the dynamic characteristics are calculated out. An artificial seismic wave is adopted as the ground motion input which is fitted with acceleration response spectrum according to the Chinese bridge anti-seismic design code. Time-integration method is used to get the seismic time-history response. Geometry nonlinear effect is considered during the time-history analysis. At last, the dynamic characteristics and the behavior of earthquake response of this type bridge structure are discussed clearly. The research results can be used as the reference of seismic response analysis and anti-seismic design for the same type of bridge.

Seismic Response Analysis of Cable-Stayed Bridges

2012 ◽  
Vol 446-449 ◽  
pp. 2290-2294
Author(s):  
Wen Liang Qiu ◽  
Meng Jiang ◽  
Xing Bo Zhang
Keyword(s):  
Time History ◽  
Element Model ◽  
Response Analysis ◽  
Longitudinal Displacement ◽  
Seismic Responses ◽  
Cable Stayed Bridge ◽  
Optimum Parameters ◽  
History Analysis ◽  
Floating System ◽  
Main Bridge

For floating system cable-stayed bridge, the longitudinal displacement of stiffening girder and moments of towers are very large when strong earthquake happens. Too large displacement of stiffening girder leads to collision between girders of the main bridge and the approaches. Using spatial finite element model and time history analysis method, the seismic responses of cable-stayed bridge are studied considering the elasto-plastic effects. The results show that the displacement of stiffening girder is very large when no seismic reduction measures are adopted. The viscous dampers installed between the stiffening girder and towers can efficiently reduce seismic responses of the cable-stayed bridge. Especially, the displacement of stiffening girder can be controlled well to meet the design requirement. Using the optimum parameters of damper, the height of pier under tower and intermediate supports in side span on seismic responses are studied in detail. The longitudinal displacement of stiffening girder increases with the pier height increasing. The intermediate supports in side span are benefit for seismic reduction.

Seismic Response Analysis of Different Plane Structure in Horizontal Direction

2011 ◽  
Vol 90-93 ◽  
pp. 2487-2491
Author(s):  
Xue Ling Li ◽  
Xiang Chao Yin ◽  
Hai Bin Zhang
Keyword(s):  
Seismic Response ◽  
Time History ◽  
Horizontal Direction ◽  
Theoretical Research ◽  
Response Analysis ◽  
Intensity Level ◽  
Building Structure ◽  
Seismic Response Analysis ◽  
Element Analysis ◽  
Short Side

The results of theoretical research and earthquake damage investigation show that seismic response analysis of different plane structure in horizontal direction is different. Dynamic characteristics and seismic response analysis of four kinds of architectural models with different planes were analyzed by using the finite element analysis software. The inherent characteristics and earthquake time-history curves in different intensity level X, Y direction of displacement, velocity, acceleration and angle displace were studied. The results show that the seismic response of the four kinds of structures separates gradually, and the separation gap increases with increase of earthquake intensity. The building structure is safer in the long side direction than that in the short side in lateral earthquake response. The irregular structure can cause strong response in both horizontal in a single direction of earthquake effect. The second floor is a weak layer of the building structure which should be paid more attention to.

Space Seismic Response Analysis of City Elevated Curved Box Girders Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 1096-1101
Author(s):  
Qing Zhao
Keyword(s):  
Seismic Response ◽  
Three Dimensional ◽  
Time History ◽  
Internal Force ◽  
Response Analysis ◽  
Box Girders ◽  
Element Analysis ◽  
History Analysis ◽  
The Finite Element Analysis ◽  
Time History Response

Taking an engineering design case about a city elevated curved box girders bridge, the dynamic calculating model of the curved box girders bridge is created by the finite element analysis program ANSYS. The analysis of curved box girders bridge with space seismic response are discussed, and a time history analysis is conducted for the curved box girders bridge subjected to the E1 Centro earthquake waves in two conditions.The internal force and the displacement time history response curve of the curved box girders bridge are obtained. The results indicate that the seismic response of curved box girders bridge with three-dimensional earthquake are bigger than two-dimensional, and consider the vertical seismic have considerable influence on the axial force of bridge piers, the internal force and displacement of box girders.

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